Oil-pumping apparatus



2 1929. G. c. ENGSTRAND 1,737,080

1011: PUMPING APPARATUS Filed Feb. 18, 1927 6fl,,,, -A 6 F/Gj Patented Nov. 26, 1929 UNITED STATES PATENT OFFICE- GUNNAR G. ENGSTRAND, OF BROOKLYN, NEW YORK, ASSIGNOR TO. SALVAGE PROCESS CORPORATTON, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK OIL-PUMPING APPARATUS My invention relates to an apparatus and method for the pumping of heavy viscous material and its transfer to any convenient place of disposal.

Such material cannot be transferred throiigh a hose or pipe line in a solid column, but has to be broken up into fragments which are carried in an air stream set up in-the transmissionline.

My invention has for its object to provide a combined vacuum pump and air compressor which alternately creates a Vacuum and com pression in a certain art of the transmission line, the ends of which art are provided with check valves so set t lat a continuous air stream is created in both the discharge line and suction line.

My invention has also for its object to make the vacuum and compression part vertical with the suction end at top and discharge end at bottom. Also by making the said part dou-,

ble and of a certain length and employing pressure regulating valves in the air pump connections it ispossible to place the intakes:

of the air pump at the lower end of said part and close the intakes before the material will reach them and the pump compression lines drives the pistons back and orth in the vacwill open and expel the material from said part before the pump intakes open again.

The whole operation will thus be continuous and the material will at no time be iven' the chance to settle and cling to the pipe ine's. In the drawing Figure 1 shows a plan view of the pumping arrangement.

Figure 2 shows an elevation of the double vacuum and compression part of the transmission line and also in a diagrammatic mannor the air pump connections thereto.

Figure 3 shows the detail of construction of the intake end of the transmission line.

Referring to the drawing in which like ref; erence characters designate corres onding parts, 1 represents the-air pump whic is rovidcd with the belt driven fi whee1'2 w ich uum cylinder 3 and in the pressure cylinder 4 by means of a conventional crank arrangement.

The vacuum cylinder is provided with the air check valves 5 which open to the atmosphere. The pressure cylinder is provided with the air intake valves 6.

Each end of the vacuum cylinder 3 isprovidcd with an intake line '7 which terminates at the lower part of the branches of the vertical part 8 of the transmission line.

Each endof the pressure cylinder 4 is similarly provided with adischarge line 9 terminating at the upper part of said branches.

The lines 7 are provided with the pressure regulating valves 10 which preferably are of the spring diaphragm type and so connected that pressure in t e pressure cylinder will cause them to close. A

The lines 9 are also provided with pressure regulating valves 11 which open at pressure in the pressure cylinder.

The two branches of part 8 are rovided with check valves 12 which open in t e direction of flow in the transmission line. The branches of part 8 join together at thetop with the suction line 13 and at the bottom with the discharge line-14.

Figure 2 shows how the pumped material is sucked into one branch of part 8 while it is being pushed out from the other.

Figure 3 shows the construction of the suction intake of the suction line13. The intake has an intake nozzle 16 of a reduced diameter and the nozzle is surrounded by holes 17 through which atmospheric air is allowed to enter into the transmission line.

The operation is as follows The air ump 1 is started and the nozzle 16 is 'inserted in the material to be pumped whereupon the material is sucked upthrough ments which are carried along by the attenul ated air stream which is created in the suction line.

Consider the moment of the pumping opcheck valves 12 do automatically take the position illustrated in the drawing at the start of the stroke.

It is to be noted that the pressure cylinder end which is connected to the respective regulating valves is still sucking in atmospheric air but with the piston .motion reversed a pressure will build up at this end and the respective regulating valve 10 will close and the attenuated air in the suction c linder will be compressed and discharged t rough the valve .5.

The regulating valve 11 in the pump discharge on the other hand will open at pressure and an air blast will emit from the pressure cylinder expelling the fragment laden air from this branch of part 8 and also reversing the position of the check valves 12.

It is to be noted that the duplex bran-ch arrangement renders the transmission continuous in the suction line as Well as in the discharge line.

Byproperly adjusting the length of the vertical part 8 it is possible to cause the pump intake to close before the material reaches the intake, and the air blast from the pressure cylinder will ex 1 the material from the part 8 before t e pump intake is again opened and the operation repeated.

It is to be noted that the material is in a continuous motion during its entire travel branches provided with pressure regulated valves set to open or close at each stroke of the pump and so connected that the suction will close before the pumped materlal reaches it and the subsequent air blast will clear the branch before the suction is reestablished.

' 3. An air transmission, comprising a suction line and a pressure line joined together b a double branched part provided wlth c ieckvalves at the ends of the branches, a vacuum cylinder having valves at 1ts ends opening outwardly, a pressure cylinder having valves at its ends open ng inwardly, oppositely .movable pistons in the cyl nders, meansfor simultaneously operating said PIS- tons, a pair of pipes connecting the ends of the vacuum cylinder to said branches, and a pair of pipes connecting theopposite ends of the pressure cylinder to said branches.

4. In an air transmission as claimed in claim 3, pressure regulated valves for the first mentioned pair of pipes, and passageways placing said valves in communication with thesecond mentioned pair of pipes.

GUNNAR C. ENGSTRAND.

through the transmission line which is of the utmost importance when heavy viscous material is being pumped.

If by chance the material shouldsettle on the inside of the transmission line it will most 'tenaciously cling thereto and interfere with the air flow and soon entirely stop the pumping operation.

The arrangement of the pump connections causes the air to move at all times in the same direction as the flow and no interfering air currents will arise.

I do not wish to be understood as limiting myselfto the specific details of construction as it is manifest that variations and modifications may be made in the adaptation of the device to various conditions without departing from the spirit and scope of my invention.

I claim '1. An air transmission comprising in combination a suction line, a pressure line, an intermediate part joining said lines together provided with check valves, anair pump and double suction and discharge connections to said intermediate part, and pressure regulated valves in said connections set to open or close at each pump stroke. I

2. In an air transmission, a suction line and a pressure line joined together by a double branched vertical part provided with check valves at the ends of the branches, an air pump, double suction and pressure connections from the air pump to each of the 

